This record as markdown: /tools/dkeeno-gitlab-mcp-server/gitlab-merge-mr.md
What gitlab_merge_mr does on Gitlab
AI agents use gitlab_merge_mr to create or update resources in Gitlab, usually the action step of a workflow, after the agent has gathered context. Every call changes real data in your Gitlab environment.
Why gitlab_merge_mr is rated Medium
Merging a merge request modifies the target branch by incorporating new code, which is a reversible write operation. While the tool description is empty, the name and server context strongly indicate code integration capability. This could cause significant disruption if misused (e.g., merging untested or malicious code to production branches), but the change can be reverted, making it Write rather than Destructive.
From the tool's definition Tool name 'gitlab_merge_mr' indicates merging a merge request. The server description mentions 'merge requests' as part of GitLab DevOps automation. Merging MRs creates/modifies code in the repository and triggers CI/CD pipelines.
Attacks that exploit this kind of access
The rule that runs gitlab_merge_mr safely
PolicyLayer is an MCP gateway: it sits between your AI agents and Gitlab, and checks every tool call against a rule you set before the call runs. Nothing changes on the server itself. For gitlab_merge_mr, this is the rule to start with:
gitlab_merge_mr stays usable, but capped: an agent stuck in a loop can't make hundreds of changes a minute. Everything else on the server is denied unless you say otherwise.
The button opens the PolicyLayer dashboard: create your workspace, connect Gitlab, apply this rule, and every gitlab_merge_mr call is checked against it from then on.
Questions about gitlab_merge_mr
gitlab_merge_mr is a write tool on the Gitlab MCP server. It is categorised as a Write tool in the Gitlab MCP Server, which means it can create or modify data. Consider rate limits to prevent runaway writes.
Register the Gitlab MCP server in PolicyLayer and add a rule for gitlab_merge_mr: allow, deny, rate-limit, or require approval. Point your MCP client at the PolicyLayer proxy URL and the rule is enforced on every call, before it reaches Gitlab. Nothing to install.
gitlab_merge_mr is a Write tool with medium risk. Write tools should be rate-limited to prevent accidental bulk modifications.
Yes. Add a rate_limit block to the gitlab_merge_mr rule in your PolicyLayer policy. For example, setting max: 10 and window: 60 limits the tool to 10 calls per minute. Rate limits are tracked per agent session and reset automatically.
Set action: deny in the PolicyLayer policy for gitlab_merge_mr. The AI agent will receive a policy violation error and cannot call the tool. You can also include a reason field to explain why the tool is blocked.
gitlab_merge_mr is provided by the Gitlab MCP server (dkeeno/gitlab-mcp-server). PolicyLayer sits as a proxy in front of this server to enforce policies before tool calls reach the server.
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